cracking unicode plain text

can hashcat bruteforce unicode hashed text?
how bute force works when cracking that type of text?
Does it takes more time to crack if we use unicode?

The simplest answer is "yes". Hashcat is capable of handling unicode.
If you are looking for straight brute force, you would simply use ?b in your mask to specify all byte-level values.
As for taking more time- that's dependent on way too many variables. It can, but it doesn't have to either. The skill of the cracker will affect this greatly.